How to plumb in a washing machine

Inspired by a helpful YouTube guide. This guide draws on “How to Install a Washing Machine” by the Proper DIY channel, a UK-based home improvement series watched by millions. The video is refreshingly clear on the drain hose height rule and inlet hose connections — two things that catch people out more than anything else with washing machine installations.

1. Check the space and services

Before sliding anything into position, confirm you have a cold water supply valve (usually a quarter-turn isolator under the worktop), a standpipe or sink for the drain, and a 13-amp socket nearby. The socket must not be on an extension lead. In the UK, you typically connect to the cold supply only — most modern machines heat their own water.

Measure the gap carefully. Most washing machines are 60 cm wide and 85 cm tall, but depths vary. An integrated machine needs clearance for the cabinet door swing as well as the machine door.

2. Remove the transit bolts

New machines always come with transit bolts protecting the drum during shipping. They are usually at the back — often four of them — and must come out before the machine runs its first cycle. Leave them in and the drum will be damaged within minutes. Keep them in a bag in case you move house.

The machine should come with a plastic bung to fill the bolt holes once removed. Fit them before pushing the machine back, otherwise you will feel a draught every time the door opens.

3. Connect the cold water inlet hose

The inlet hose screws onto the back of the machine at one end (usually a standard ¾-inch BSP fitting with a rubber washer inside) and onto the isolator valve at the other. Hand-tighten first, then a quarter-turn with a spanner. Do not overtighten — the rubber washer does the sealing, not brute force.

If the existing hose is more than five years old, replace it. A split hose is one of the most common sources of serious water damage in a kitchen or utility room.

4. Set up the drain hose

The drain hose must loop up to at least 60 cm above floor level before it drops into the standpipe or over the sink. This air break prevents dirty water being siphoned back into the machine. Most machines come with a plastic hose guide to help form the loop correctly — use it.

If you are using a standpipe, push the drain hose in no more than 15 cm and secure it with a cable tie or hose clip so it cannot work itself out mid-cycle. A hose that pops out during a spin cycle is as unpleasant as it sounds.

5. Level the machine

All four feet must be in firm contact with the floor. Adjust the front feet by turning them clockwise to lower, anticlockwise to raise. Most machines have self-locking nuts on the feet — tighten the lock nut back up against the base once you have the height right.

A machine that is not level will vibrate excessively, walk across the floor, and eventually damage itself. Use a spirit level on top of the drum if you want to be precise. To be fair, most surfaces are close enough that a visual check will do.

6. Make the electrical connection and test

Plug into a fused 13-amp socket — not an extension lead. Turn on the cold water isolator slowly and check the inlet hose connection for drips. Run a short test cycle, ideally on a warm wash, and watch the drain hose during the first pump-out to make sure it stays seated and drains freely.

Once the cycle has finished, check under the machine and behind it for any moisture. A small drip at a connection that looks fine under static pressure can show up under the pulsing pressure of a pump-out.

When to call a handyman

Call Richard if there is no existing standpipe and one needs fitting, if the isolator valve is seized and needs replacing, or if the machine needs moving into an awkward position under a worktop and you need an extra pair of hands. Getting the drain hose height wrong is an easy mistake — well worth having it checked if you are not certain.